在关节动物的细菌共生体中,专门的毒素库的演化
Logan D Moore1, Matthew J Ballinger1
1Department of Biological Sciences, Mississippi State University, Mississippi State, Mississippi, United States.
The ISME journal
|August 12, 2025
概括
螺旋共生体使用毒素来保护果免受寄生虫的侵害. 这些毒素向核糖体,但附属域有助于它们区分寄生虫和宿主,保护宿主免受伤害.
科学领域:
- 微生物学 微生物学
- 共生关系是共生关系.
- 分子生物学分子生物学
背景情况:
- 细菌利用有毒蛋白质进行入侵和生存.
- 共生细菌提供宿主防御寄生虫使用毒素.
- 交生虫毒素必须准各种寄生虫,同时不伤害宿主.
研究的目的:
- 研究Spiroplasma核糖体失活蛋白 (RIPs) 的特异性.
- 了解RIP如何在宿主和寄生虫目标之间进行歧视.
- 阐明毒素域在特异性和宿主保护中的作用.
主要方法:
- 在大肠杆菌中表达了来自Spiroplasma的五个不同的RIP.
- 在实验室和活昆虫/真菌细胞中通过RIP评估核糖体无活化.
- 通过删除辅助域来研究它们的功能来截断RIP.
主要成果:
- 所有五个RIP都通过在α-sarcin/ricin循环中的腺素裂变使净化后的核糖体失活.
- 在活细胞上测试时,对毒素的核糖体无活化有所不同,表明细胞特异性.
- 截断的RIP显示了体外活性增加,这表明辅助领域限制了毒性.
- 一个截断的RIP在体内表现出减少的细胞核糖体失活,突出了细胞特异性的辅助域作用.
结论:
- 螺旋体RIP具有保留的核糖体失活活性,但表现出细胞特异性向.
- 在RIP上的辅助域在调节毒性和实现特异性方面发挥着至关重要的作用.
- 动态毒素进化有助于防御性共生关系的稳定性和新性.
相关概念视频
01:31Defense Against Bacterial Pathogens
1.5K
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
1.5K
01:16Transduction
107
Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
107
01:36Types of Toxins
2.0K
Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
2.0K
01:15Diversity of Protists I
122
Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
122
01:24Diversity of Archaea II
89
Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
89
01:30Bacterial Phylum Actinobacteria
114
Coryneform bacteria are gram-positive, aerobic, nonmotile rods that exhibit irregular, club-shaped, or V-shaped arrangements. Their V-shape results from snapping division, where the inner cell wall layer forms the cross-wall, while the outer layer remains intact until it ruptures on one side, causing the daughter cells to bend away.The primary genera are Corynebacterium and Arthrobacter. Corynebacterium includes diverse species, ranging from saprophytes to pathogens like Corynebacterium...
114